A Neg is very necessary for seduction. To understand why you must see how a girl feels when she is out with her friends.In a night environment women are attracting the attention of many drunk men. This is because most men are very hesitant to approach women they do not know so in order to find courage they do US have they drink to compensate that. This also means that a man  that drinks in order to find the courage to talk to a woman is probably also a very bad seducer too.

As a result women raise the shields in order to keep their peace of mind while they are out. In order to get around on the problem a very specific seduction technique is necessary. This technique is called neg. It consists of making a back headed compliment that aims at making the girl feeling more aware of herself.

It also helps   disqualify yourself as a potential suitor, thus permitting you to trigger attraction switches one by one. If you want to see the exact uses of neg in seduction look here.